[gcc_release] Generate release/snapshot announcements on the fly

[Kelley Cook]

>>   gcc-g77-3.5-20040801.tar.bz2          The F77 front end and runtime.
>
> Hmmm, I still see g77 being generated from mainline, in spite of the 
> effort I expended to remove every trace of it ...
> 
> Does anybody know what's going on here ?

This patch hopefully will fix the problem.

With it, we will now generates the README and index.html on the fly from the gcc_release script.

Cavaets: It requires an echo that recognizes the non-posix "-e" switch so I can output newlines.

In addition it changes the currently blank file LATEST-IS-3.5-20040802 to be a symbolic link 
LATEST-3.5 pointing to the proper directory.  I think this is a good change, but for cleanup it 
will require the manual removal of the currently generated LATEST* files.

Tested as best I could with a cobbled together ftp/snapshots directory.
Generated README looks good.
Generated index.html passes validator.org

OK?

Kelley Cook


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